We just visited the  festival and conference Enter_Unknown Territories for new technology art that took place from 25 to 29 April 2007 in Cambridge. Various artists and media activists/inventors showed their work in a bunch of spherical tents on the common. 
 
We were particularly impressed by the Temporary MediaShed. Mediashed is a ‘free media space’ in the¬† East of England where people can make things by using free software and recycled equipment. They do great projects. Take a look: mediashed.org